CD8A and systemic lupus erythematosus: Dual immunofluorescence staining also revealed that, compared with the controls, CD8+NKG7+ T cells derived from SLE patients displayed significantly higher levels of CD7 and CD74 (Figure S5A), and TdT‐mediated dUTP nick‐end labeling (TUNEL) staining revealed that the apoptotic proportion of CD8+NKG7+ T cells derived from SLE was obviously higher than that in controls (Figure S5B).